Here is the MONO (Vhull) that I'd recommend:

-HobbyKing PURSUIT (32")

You can buy it ARTR with hull/hardware(strut-rudder-turn fins-trim tabs)/& a cheap motor for around $225 on Hobbyking's site. Just add Tx/Rx, servo, batts.

You can find everything you need to know at: www.offshoreelectrics.com
They also have the best (F)ast(E)lectric Boating Forum.

I have a PURSUIT that I built for my son. It runs at around 50mph now, and I have about $400 in it. With a bigger motor and prop, it would approach, and handle 60mph, no problem. If you wanted to go bigger, you can step up to a longer hull. OSE has all that in their online store.

Thanks,
-Chad